Question about 3/4 S-Trap

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by iminaquagmire, Mar 15, 2009.

  1. iminaquagmire

    iminaquagmire DIY Senior Member

    Messages:
    207
    Would this be one? The trap would be that of a 2nd floor shower. The top outlet of the santee would tie into the stack vent in the attic, the bottom into a 90, then run parallel to the joists to the stack ~4 feet away. I know it would be if it downturned directly after the trap outlet, but ~24" away?

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  2. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Messages:
    1,705
    Location:
    Chicago, IL
    Yes, you would need to vent before the offest.
  3. kingsotall

    kingsotall Plunger/TurdPuncher

    What software did you use iminaquagmire¿
  4. cwhyu2

    cwhyu2 Consultant

    Messages:
    1,348
    Location:
    Cincinnati OH
    Me too I use sketchup but havn`t mastered it yet.
  5. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Messages:
    1,705
    Location:
    Chicago, IL
    I too would like to know which software.
  6. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Any time the trap weir is above the trap arm inlet you have the possibility if creating a siphon. I've never been quite wure who coined the term 3/4 S trap and stuck it to just about any non compliant Trap arrangement. True 3/4 S traps were a cast iron fitting.
  7. iminaquagmire

    iminaquagmire DIY Senior Member

    Messages:
    207
    Thanks for the help. Looks like I'll have to figure out another way to do this. I'm trying to raise the trap outlet so that I can fit a can light under the trap for the shower below. The reason it can't go up higher is that the santee pictured in the model doesn't actually exist, instead there is a double fixture fitting for the drain for the bathtub which can't be moved. I just didn't want to take the time to model the other drain.

    I made that in Google Sketchup 6. I haven't tried Sketchup 7 yet but it looks nicer. Both are free but you can buy a pro version for $95. The pro version would be overkill for me, but it may be justifiable for pitching proposal to clients for pros.

    Its really easy to learn and there are many "components" such as sinks and cabinets and fixtures that can be downloaded. I don't know how good it would be for pipes, as its kind of difficult to rotate and line up fittings, but for layout and design its great.
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,048
    Location:
    Cave Creek, Arizona
    3/4 s

    . A true "S" trap discharges vertically. A "P" trap discharges horizontally, and can be considered a half "S" trap. Discharging at an angle between the two, creates a 45 degree angle which is intermediate between a full and a half so it becomes a 3/4 "S" trap.
  9. kingsotall

    kingsotall Plunger/TurdPuncher

    Nice. I'm still learning how to plan layouts isometrically. I'll stick with my 30/60 right triangle for now.
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